Wire drawing drum



July 26, 1938. G, WOODWARD 2,124,967

WIRE DRAWING DRUM Original Filed Nov. 22, 1935 INVENTOR Patented July 26, 1938 UNITED STATES WIRE DRAWING DRUM George Woodward, West Orange, N. J., assignor to Igoe Brothers, Newark, N. J.

Application November 22, 1935, Serial No. 50,998 Renewed January 4, 1938 1 Claim.

This invention relates to a wire drawing machine that accomplishes two or more successive drawings of the same Wire in a continuous process and accomplishes this by substantially equalizing the tension on the wire throughout its drawn length.

The machines formerly employed for this purpose were expensive and unsatisfactory. The expense was caused by complicated mechanism such as differential gearing and other means of compensating for the speed of the wire as it is drawn by one drum on its first drawing and then drawn and coiled on the second drum. In order to secure uniformity of finish and size the tension of the wire is maintained by the present machine.

The invention is designed to provide an economical machine which requires no differential gearing since both drums can be rotated at the same speed at which the wire is moving which allows them to be driven on the same shaft. This economizes in space and power.

The manufacture of wire from bars leaves the wire with a scale which must be removed. The scale is removed after the pickling process by water under pressure and the wire is then allowed to stand and a green coating forms on the wire. The coating is washed off lightly and the wire is then put into a hot lime bath. The wire is then racked and dried. This leaves the wire with a thin coating that acts as a lubricant when the wire passes through the die. The present device by rotating the drums at a speed constant with the speed of the wire prevents any scraping of this coating and this in turn assists in the drawing due to the presence of the coating and, in consequence, the dies last longer and the drawing is easier and more satisfactory.

The invention also relates to certain details of construction which will be hereinafter more fully described.

The invention is illustrated in the accompanying drawing. Figure l is a diagrammatic view of my improved machine. Figure 2 is a side view of the two drawing drums with the lower part shown in section. Figure 3 is a bottom view of figure 2 with the bottom plate removed.

A diagrammatic view is presented in Figure 1, showing a die H] which is the first die through which the wire passes and a second die ll through which the wire is drawn. a second time. The wire is drawn through the first die by a drum l2 and is returned to the second die, usually over a pulley I3 and then drawn through the die H by the drum I4.

The wire passes around the drum [2 three or four turns and on the drum I4 it is coiled into the coil I5 for the proper length to provide the required size of coil and then removed as the product of the machine. The drums l2 and I4 rotate at the same speed and are usually secured together or to the same shaft I6.

The drum I4 is a convenient drum usually with a tapered periphery and of considerable height with a projecting apron I l at the bottom. The top is open to permit the lifting and removal of the coil l5 of wire when the coil has reached the desired or predetermined weight.

The drum I2 is designed to include a slipping or lost-motion feature to slip in order to prevent the drum l2 passing along more wire to the second die than the drum M can take. This must be done without injury to the wire on the drum l2. The construction must be such that the wire engaging part of the drum I2 rotates at a speed that is the same as the speed of the wire in order that no scraping takes place to remove the coating from the wire.

The form of drum i2 is preferably made of 0 a top plate l8 and a bottom plate l9 secured together, as by the screws 20. One of the plates has an annular flange or wall 2! extending to the other plate. Outside this Wall is the slip ring 22 usually made up of sections 23 that are areshaped and normally slightly separated as at 24. This clearance allows the sections tomove inwardly to a limited extent. The two plates 18 and i9 have opposed flanges 25 and 26 which confine the ring sections 23 against outward movement. If desired, I may place an annular backing 2'! in the form of a ring or split ring,

this backing being of material such as of asbestos,

fibre, or the like or any resilient means that is compressible such as springs. This drum, with or without the ring 21, allows the sections 23 to move inwardly to slightly reduce the diameter of that part of the drum that receives the coil, that part being the periphery of the slip ring formed by the sections 23. The flanges 25 and 26, particularly the latter, act to prevent coating from the wire from working in behind the rings or segments 23. The presence of the coating on the inside face of the parts 23 causes them to bind and they will not slip on the wall 2|. In order to prevent this and insure slipping of the parts under pressure the flanges, especially the flange 26 acts to ward off and collect the coating which does not enter behind the flange nor behind the split ring parts.

It will be evident that in the event of excess ing a top plate and a bottom plate, one of said plates having an annular wall extending to the other plate, means for securing said plates together, a sectional slip-ring surrounding said Wall, said ring having a recess on the bottom edge of its outer wall, a flange on the bottom plate and fitting said recess, a flange on the top plate overlapping the top edge of the ring, and. a resilient medium between the wall and the ring.

GEORGE WOODWARD. 

